CN112615491A - Novel installation method of AXOFLEX type elastic damping coupler of nuclear power plant - Google Patents
Novel installation method of AXOFLEX type elastic damping coupler of nuclear power plant Download PDFInfo
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- CN112615491A CN112615491A CN202011557374.5A CN202011557374A CN112615491A CN 112615491 A CN112615491 A CN 112615491A CN 202011557374 A CN202011557374 A CN 202011557374A CN 112615491 A CN112615491 A CN 112615491A
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- axoflex
- cav
- elastic block
- power plant
- nuclear power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
Abstract
The invention belongs to the technical field of mechanical maintenance, and particularly relates to a novel installation method of an AXOFLEX type elastic damping coupler of a nuclear power plant, which comprises 7 steps of centering adjustment, elastic block thickness measurement, installation distance measurement, pair wheel distance adjustment, installation gap range calculation, elastic block replacement and coupler installation. The method eliminates the adverse effect on the installation distance caused by the aging of rubber of the elastic block and the stress deformation of the disc of the AXOFLEX type coupler after long-term operation, and reduces the axial unbalance force of the coupler; the adverse effect on the axial vibration of the rotary machine equipment caused by the axial unbalanced force of the elastic block of the AXOFLEX type coupling is eliminated.
Description
Technical Field
The invention belongs to the technical field of mechanical maintenance, and particularly relates to a novel installation method of an AXOFLEX type elastic damping coupler of a nuclear power plant.
Background
The nuclear power plant rod power supply system mainly provides direct current for a reactor control rod driving mechanism, and comprises 2 sets of power generating sets, wherein each set comprises 1 driving motor and 1 power generator, and the reliability of the power generating sets directly influences the safe and stable operation of the power generating sets. An AXOFLEX type coupler is adopted between a motor and a generator of a nuclear power plant rod power system, and the motor and the generator can be centered and adjusted once in each cycle.
According to technical requirements and parallel experience of manufacturers, most couplers mark components such as a diaphragm, an elastic block, a pair wheel and a middle section before disassembly, the couplers are re-assembled according to the original marks strictly after centering adjustment is qualified, and meanwhile, the elastic quick-mounting gap standard of the couplers of the type is lacked in the industry. Due to the aging of the elastic block rubber and the stress deformation of the mounting disc after the long-term operation of the elastic block rubber, the sizes of the elastic block rubber of the AXOFLEX type coupler and the mounting disc of the elastic block rubber can be slightly changed, so that the original elastic quick mounting gap is changed, and the original shape can be mounted, so that the equipment is vibrated and the like.
Since 2017, after a certain power plant uses a rod power system motor of an AXOFLEX type coupler to overhaul, the problem of high vibration occurs for many times, and the problem is not thoroughly solved through various modes such as centering adjustment, foundation adjustment, motor disassembly and the like. The inspection shows that the coupling mounting disc is deformed, and the elastic blocks find that the thickness of the coupling mounting disc is uneven, so that the gap deviation of different elastic block positions of the coupling mounting disc is large.
Disclosure of Invention
In view of the above disadvantages, the present invention aims to provide a novel installation method for an AXOFLEX type elastic damping coupling in a nuclear power plant, which includes measuring the thickness of an elastic block of the AXOFLEX type coupling, measuring and adjusting an installation distance, adjusting an installation position again, identifying and replacing too large elasticity of an installation gap according to a theoretical gap range calculation method, and eliminating the problems of unbalanced axial force and high vibration caused by inherent characteristics of the AXOFLEX type coupling by improving a method for installing a coupling elastic block.
The technical scheme of the invention is as follows:
a novel installation method of an AXOFLEX type elastic damping coupler of a nuclear power plant comprises 7 steps of centering adjustment, elastic block thickness measurement, installation distance measurement, wheel pair distance adjustment, installation gap range calculation, elastic block replacement and coupler installation;
step one, performing coupler centering adjustment by adopting a three-meter method, wherein two dial indicators vertically point to the end face of a pair wheel, one indicator points to the circumference, and the deviation of the end face non-parallelism and the circumference non-concentricity is adjusted to be within 0.05 mm;
step two, measuring and recording the thickness x of each elastic block, and calculating the average value x of the thickness xavThe thickness is sequenced from large to small and numbered as X1、X2、X3······XnMarking the elastic block;
step three, measuring and recording the distance y between the coupling and each wheel position, and calculating the average value yavThe numbers are sorted from large to small according to the space and are respectively marked as Y1、Y2、Y3······YnMarking on the pair of wheels;
fourthly, the motor is translated along the axial direction, and the axial distance between the coupling and the wheel is adjusted to enable the distance to be average yavIn [ x ]av+0.20mm,xav+0.60mm)]Within the range, so as to ensure that an axial clearance exists between each elastic block and the paired wheel;
step five, according to the principle of one-to-one correspondence from large to small, namely X1-Y1、X2-Y2······Xn-YnRe-matching the elastic block of the coupling with the mounting position;
sixthly, calculating installation gaps C1, C2 and C3 & cng corresponding to the latest positions of the elastic blocks, wherein the average value is Cav, and controlling the gap deviation | Cx-Cav | within a range in order to avoid the excessive gap deviation from causing the axial vibration of the equipment to exceed the standard;
step seven, namely Cx needs to be in the range of [ Cav-60V/n, Cav +60V/n ], otherwise, the corresponding elastic block is replaced; and after the installation clearance is ensured to be within the qualified range, installing and fastening each elastic block according to the torque standard.
In the sixth step, in the control range of | Cx-Cav |, the specific theoretical calculation method is as follows,
|Cx-Cav|*n/60≤V
wherein n is the rotation speed and the unit rotation/minute; v is the vibration speed in mm/s.
When n is 1500rpm and V is 5.6mm/s, | Cx-Cav | ≦ 0.224 mm.
The invention has the beneficial effects that:
1) the adverse effect on the installation distance caused by the aging of rubber of an elastic block and the stress deformation of a disc due to long-term operation of the AXOFLEX type coupler is eliminated, and the axial unbalance force of the coupler is reduced;
2) the adverse effect on the axial vibration of the rotary machine equipment caused by the axial unbalanced force of the elastic block of the AXOFLEX type coupling is eliminated.
According to the method, the coupler of the rod power supply motor of the nuclear power plant unit is used and verified in 2020, and the vibration of the motor is reduced to 2.1mm/s from the previous 6.3mm/s (horizontal direction) after the coupler is installed, so that the problem of high vibration of the rod power supply unit which troubles the unit for years is thoroughly solved, and a good effect is achieved.
Drawings
Fig. 1 is a schematic diagram of a nuclear power plant rod power supply unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The novel installation method of the AXOFLEX elastic damping coupler in the nuclear power plant mainly comprises 7 steps of centering adjustment, elastic block thickness measurement, installation distance measurement, pair wheel distance adjustment, installation gap range calculation, elastic block replacement, coupler installation and the like, and specifically comprises the following steps:
1) the coupler centering adjustment is carried out by adopting a three-meter method, wherein two dial indicators vertically point to the end face of the coupling wheel, one indicator points to the circumference, and the deviation of the non-parallelism degree and the non-concentricity degree of the circumference of the end face is adjusted to be within 0.05mm (the common centering standard of rotating equipment in the power industry);
2) measuring and recording the thickness x of each elastic block, and calculating the average value xavThe thickness is sequenced from large to small and numbered as X1、X2、X3······XnMarking the elastic block;
3) measuring and recording the distance y between the coupling and each wheel, and calculating the average value yavThe numbers are sorted from large to small according to the space and are respectively marked as Y1、Y2、Y3······YnMarking on the pair of wheels;
4) axially translating the motor, adjusting the axial spacing of the coupling wheels so that said spacing is on average yavIn [ x ]av+0.20mm,xav+0.60mm)]Within the range, a certain axial clearance is ensured between each elastic block and the paired wheel;
5) according to the principle of one-to-one correspondence from large to small (namely X)1-Y1、X2-Y2······Xn-Yn) Re-matching the elastic block of the coupling with the mounting position;
6) calculating the installation gaps C1, C2 and C3 & cng of the latest positions corresponding to the elastic blocks, wherein the average value is Cav, and in order to avoid the over-standard axial vibration of equipment caused by overlarge gap deviation, the gap deviation | Cx-Cav | needs to be controlled within a certain range, and the specific theoretical calculation method is as follows:
| Cx-Cav | n/60 ≦ V (formula 1)
Wherein n is the rotation speed and the unit rotation/minute; v is the vibration speed in mm/s.
For example, | Cx-Cav | ≦ 0.224mm when n is 1500rpm and V is 5.6 mm/s.
7) That is Cx is required to be in the range of [ Cav-60V/n, Cav +60V/n ], otherwise, the corresponding elastic block is replaced. And after the installation clearance is ensured to be within the qualified range, installing and fastening each elastic block according to the torque standard.
Example 1:
taking the installation process of the coupling during vibration treatment of the 2RAM002MO motor of the nuclear power plant 2RAM002MO in 6 months in 2020 as an example, a cross-type installation method of the AXOFLEX type elastic damping coupling is introduced, which comprises the following specific steps:
the coupler centering adjustment is carried out by adopting a three-meter method, the end surface dial indicator points to the outer side of the disc, two pairs of wheels on two sides are required to be on the same disc during centering, the centering result is that the end surface deviation is 0.025mm at most, the excircle deviation is 0.045mm at most, and the standard is that the excircle/end surface deviation is less than or equal to 0.05 mm;
measuring and recording the thickness x of each elastic block, and calculating the average value xav54.67mm, and the thickness is numbered from large to small and respectively marked as X1、X2、X3······X10Marking the elastic block;
measuring and recording the distance y between the coupling discs at each position, and calculating the average value yav55.00mm, and the numbers are numbered according to the sequence from large to small of the space and are respectively marked as Y1、Y2、Y3······YnMarking the disc;
according to the measured data and the sequence number, according to X1-Y1、X2-Y2…X10-Y10According to the corresponding principle, the elastic block of the coupling is matched with the mounting position in a crossing way;
calculating the average y of the above distancesavIn [ x ]av+0.20mm,xav+0.60mm)]Within the range;
the clearance C1, C2 and C3. C10 values (see the table below) after re-matching are calculated, the average value is Cav and is 0.32mm, the maximum installation clearance is 0.12mm, and the theoretical calculation is within the range of 0.224 mm;
table 1 (reference example) table of mounting dimensions of AXOFLEX type coupling
According to X1-Y1、X2-Y2…Xn-YnAccording to the corresponding principle and the matching relation, the elastic block of the coupler is installed, and bolt fastening is carried out according to the torque standard;
after the installation and the restart verification are completed, the vibration of the motor is reduced to 2.1mm/s (the standard is 5.6mm/s) from the maximum 6.3mm/s (in the horizontal direction), the problem of high vibration of the rod power supply unit which troubles the unit for many years is thoroughly solved, and a good effect is achieved.
In the drawings of the disclosed embodiments of the invention, only methods related to the disclosed embodiments are referred to, other methods can refer to common design, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. The utility model provides a novel installation method of nuclear power plant AXOFLEX type elasticity shock attenuation shaft coupling, contains centering adjustment, elastic block thickness measurement, installation interval measurement, wheel pair interval adjustment, installation clearance range calculation, elastic block change and shaft coupling installation 7 steps altogether, its characterized in that:
step one, performing coupler centering adjustment by adopting a three-meter method, wherein two dial indicators vertically point to the end face of a pair wheel, one indicator points to the circumference, and the deviation of the end face non-parallelism and the circumference non-concentricity is adjusted to be within 0.05 mm;
step two, measuring and recording the thickness x of each elastic block, and calculating the average value x of the thickness xavThe thickness is sequenced from large to small and numbered as X1、X2、X3······XnMarking the elastic block;
step three, measuring and recording the distance y between the coupling and each wheel position, and calculating the average value yavThe numbers are sorted from large to small according to the space and are respectively marked as Y1、Y2、Y3······YnMarking on the pair of wheels;
fourthly, the motor is translated along the axial direction, and the axial distance between the coupling and the wheel is adjusted to enable the distance to be average yavIn [ x ]av+0.20mm,xav+0.60mm)]Within the range, so as to ensure that an axial clearance exists between each elastic block and the paired wheel;
step five, according to the principle of one-to-one correspondence from big to small, namelyX1-Y1、X2-Y2······Xn-YnRe-matching the elastic block of the coupling with the mounting position;
sixthly, calculating installation gaps C1, C2 and C3 & cng corresponding to the latest positions of the elastic blocks, wherein the average value is Cav, and controlling the gap deviation | Cx-Cav | within a range in order to avoid the excessive gap deviation from causing the axial vibration of the equipment to exceed the standard;
step seven, namely Cx needs to be in the range of [ Cav-60V/n, Cav +60V/n ], otherwise, the corresponding elastic block is replaced; and after the installation clearance is ensured to be within the qualified range, installing and fastening each elastic block according to the torque standard.
2. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 1, characterized in that: in the sixth step, in the control range of | Cx-Cav |, the specific theoretical calculation method is as follows,
|Cx-Cav|*n/60≤V
wherein n is the rotation speed and the unit rotation/minute; v is the vibration speed in mm/s.
3. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 2, characterized in that: when n is 1500rpm and V is 5.6mm/s, | Cx-Cav | ≦ 0.224 mm.
4. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 1, characterized in that: in the first step, the centering result is that the end surface deviation is 0.025mm at most, the excircle deviation is 0.045mm at most, and the standard is that the excircle/end surface deviation is less than or equal to 0.05 mm.
5. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 1, characterized in that: said step of four-pitch averaging yavIn [ x ]av+0.20mm,xav+0.60mm)]Within the range.
6. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 1, characterized in that: and step six, the average value is Cav of 0.32mm, the maximum mounting clearance is 0.12mm, and the maximum mounting clearance is within the range of 0.224mm in theoretical calculation.
7. The novel installation method of the AXOFLEX elastic damping coupling of the nuclear power plant as claimed in claim 1, characterized in that: in the sixth step, in the control range of | Cx-Cav |, the specific theoretical calculation method is as follows,
|Cx-Cav|*n/60≤V
wherein n is the rotation speed and the unit rotation/minute; v is the vibration speed in mm/s;
when n is 1500rpm and V is 5.6mm/s, | Cx-Cav | ≦ 0.224 mm.
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